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There should be no problem installing both Mozilla 1.0 and Netscape 7.0 (RC1). Neither will conflict with your current browsers.

I recommend installing the latest official version of Mozilla, which is 1.0, rather than using an older version. The current Netscape 7 preview is based on an older build of Mozilla (RC2 I believe) but the official 7.0 release will incorporate the Mozilla 1.0 bug fixes. Ultimately, for rendering purposes, Mozilla and Netscape will render exactly the same, however there are some plugins and extensions provided for Netscape that aren't always available for Mozilla (without a little hacking).

As for IE, there are ways to have more than one version at the same time, but I don't know them. Because their install process is so exclusive and likes to overwrite the older version, I typically recommend just installing a different version on a seperate machine.

Actually, I'm pretty sure Mozilla 1.0 and Netscape will not work together on the same computer. It's kind of like having two versions of IE, just doesn't work. I would uninstall Netscape in a snap and run Mozilla, which boasts everything Netscape does without the commercialized junk.

From experience you cannot have Netscape 6.X+ and any Mozilla builds installed at the same time. They cause all sorts of conflicts to the point that neither browser is usable. However you can have one of them (i'd recommend Mozilla), IE, Opera and other browsers installed with no problems.